Yamaha Champ is a mess..... but it runs

Matt Wilson /

Tonight I got enough time to take a look at the yamaha champ that I bought a week ago. I bought it for $40... and its really a piece of junk.

I just want to be able to cruise around my campus and piss off the public saftey officers :)

The big thing that I had to do was get spark. I took a quick look at the points and they opened and closed fine. The guy I bought it from said he thought it needed a new coil or something. Well the coil wasn't plugged in, and neither were any of the other wires. I junction box had seperated and there were tons of loose wires.

I connected all the wires as best I could by matching colors and then rolled down the hill. I had a very big spark. If I couldn't get a spark I was going to sell the bike because the only place to get the wiring schematic is at a yamaha dealer with the $80 service manual.

So I dripped a little gas into the head and it fired up. It has 100lbs compression so it should run, but maybe not great.

The carb was clogged and I didn't really feel like cleaning it tonight, but maybe tomorrow. The fuel leaks out of the fuel inlet to the carb. I will have to try and get a new one from a dealer.

I think the bike is a 80cc, but I'm really not sure, I plan on measuring the piston and the stroke tomorrow.

I may get a new piston and rings for it if I can find them. Does anyone know a good mail order yamaha dealer?

Or does anyone have any parts for it?

Also if I got a new piston, do I need to get an oversize, or will the standard be fine. I have no idea how many miles are on this but I'm guessing 4-7000mi.

I'll take some pictures when I work on it some more.

Re: Yamaha Champ is a mess..... but it runs

Matt Wilson /

I have an extra dellorto carb and malossi cylinder and reeds at home from my yamaha scooter.

I'd be cool if it fits.

Re: Yamaha Champ is a mess..... but it runs

Matt Wilson wrote:

> I think the bike is a 80cc, but I'm really not sure, I plan

> on measuring the piston and the stroke tomorrow.

>

> I may get a new piston and rings for it if I can find them.

> Does anyone know a good mail order yamaha dealer?

>

> Also if I got a new piston, do I need to get an oversize, or

> will the standard be fine. I have no idea how many miles are on this but I'm guessing 4-7000mi.

Almost all Jap. bikes have the actual displacement cast into the base of the cylinder on either the left or right side .. you have to bend over and look close .. like 49cc or 79cc.

Go to anywhere that sells magazines and look in the back at the small ads of a motorcycle mag .. copy down 4 phone numbers for dealers that say .. 'discount Yamaha parts' .. they will be like 30% off list price.

They are toll free calls.

Measure the piston to cyl clearance with a feeler guage with the bott of piston at bott of cyl .. stock clearance is about .0015" .. max recommended clear is bout .008"

Re: Yamaha Champ is a mess..... but it runs

Matt Wilson /

Fred,

How does the fuel tap go into the minkuni carb?

I'm talking about the bent noodle that the fuel line slides over. My fuel tap is very loose and gas leaks out. The fuel tap occaisionally falls out of the carb, its so loose.

I think that I may see if I can cover it in JB weld and get it to stay in there.

What do you think?

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